Black Bits and Fungal Growth

Some customers contact Hartlepool Water because they have noticed grey or black jelly-like substances in their water and are concerned about the quality of their supply. Such substances are airborne fungal spores and are not connected with the quality of the water supply. Although these growths can look very unpleasant they are harmless and are not a risk to health.

Fungi likes to establish itself in moist areas and can commonly be found growing in the following locations:

On the end of cold water taps (usually kitchen or bathroom)
In washing machines (particularly around the powder drawer)
In toilet cisterns and bowls
In shower heads
Around tiles in bathrooms/shower rooms
On shower curtains or towels (often appears as spots or staining)
In waste traps connected to sinks.

FAQs

How does it form?

Fungal spores are naturally present in the environment. It is only when they find themselves in a suitable warm, moist location with a source of food that the spores multiply and produce a grey or black jelly-like growth.

Water provides the moisture that these fungi need to grow and hence they are usually found growing in environments such as those listed above or any area where there is standing water. Normal household heating provides the warmth, and there are sufficient nutrients around in the environment to provide an adequate food source.

Growth can be extremely rapid in certain environments with plenty of nutrients present, such as in a bathroom or kitchen. These rooms tend to be warmer than others in the house and are also relatively humid. In a bathroom, the propellants from aerosols, hair spray and deodorants and soap residues all provide a rich source of nutrients and can accelerate growth even further.

It is the local environmental conditions that cause fungal growths. Therefore, improving ventilation is a good way to reduce the problem. However, the increased use of double-glazing has resulted in the problem becoming worse, as this eliminates any drafts and subsequently reduces ventilation.

How can I prevent fungal growth?

Fungal growths can be difficult to eliminate entirely. Improving ventilation is the best means of prevention.

To help reduce the chances of re-growth, remove any lime scale as this provides a rough surface for the organisms to latch onto. Cleaning the affected area with diluted bleach or sodium bicarbonate solution will aid the removal of these growths.

For further information view our fungal growth facts sheet or contact us

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Black Bits and Fungal Growth

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